Self-Sealing Spout for Dentifrice Dispensing Toothbrush
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Solution Overview
Problem
Conventional electrical toothbrushes face issues with material waste, battery power consumption, and difficulty in dispensing dentifrice material, particularly for handicapped users, due to bulky designs and non-self-closing spouts that lead to clogging and drying of dentifrice.
Innovation Solution
A dentifrice dispensing electrical toothbrush with a driver-pump head and a slit spout that self-seals to prevent drying, a replaceable brush unit without a conventional neck, and a refillable cartridge, using an elastic button for pumping pressure and vacuum force to advance dentifrice, while oscillating brush elements without vibrating the handle or neck, saving battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional spout is used for dispensing dentifrice material, then the spout can dispense dentifrice, but the spout requires manual capping which is often ignored resulting in clogging and pumping failures
Solution Approach 1:
The spout is designed with a self-sealing mechanism that automatically closes after dispensing dentifrice material, eliminating the need for manual capping by the user. The self-sealing spout uses the pressure differential created during pumping to force the spout open for dispensing, then automatically seals itself when pumping stops, preventing drying and clogging without requiring user intervention.
2Productivity
If the spout remains open to dispense dentifrice material, then the dentifrice can flow to the brush head, but the dentifrice material dries out and causes clogging of the flow channel
Solution Approach 1:
The spout transitions dynamically between open and closed states based on pumping pressure. During pumping, the pressure differential forces the spout open to allow dentifrice flow. When pumping stops, the pressure equalizes and the spout automatically closes to prevent drying. This dynamic behavior ensures continuous productivity during use while preventing clogging during storage.
3Device complexity
If manual capping is required for the spout, then the design is simple, but the operation is inconvenient particularly for handicapped users
Solution Approach 1:
The self-sealing spout performs the capping function automatically without requiring manual operation. The system uses its own pumping pressure to control the spout opening and closing, making the device self-servicing and eliminating the need for handicapped users to perform difficult manual capping operations.
4Strength
If the brush elements are mounted on fixed posts requiring significant pulling force to detach, then the mounting is secure, but the replacement is difficult for general users
Solution Approach 1:
The mounting system transitions from a static fixed-post design to a dynamic snap-fit mechanism. The brush element mounting includes flexible arms that can be easily deflected by finger pressure to disengage from the driving mechanism, allowing simple replacement by general users while maintaining secure mounting during use through elastic retention forces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces material waste, conserves battery power, and ensures easy one-handed operation with automatic sealing of the spout, preventing dentifrice drying and clogging, making it more ergonomic and accessible for all users.
Implementation Method 1
An elastic compressible button is used to apply pumping pressure. The slit spout is forced to open by the exiting dentifrice material
Implementation Method 2
The slit spout is forced to open by the exiting dentifrice material and to close by the vacuum force created when the pumping pressure is released. The vacuum force also causes the piston in the cartridge advance to push the dentifrice material into the pumping chamber
Data Source
AI summary
Dentifrice dispensing electrical toothbrush comprising a driver-pump head with a dispensing platform, a replaceable brush unit and a handle having a battery and a cartridge containing dentifrice material. The replaceable brush unit includes a oscillatory brush element and a brush element having a circular or an elongated spout opening as well as a snap-on mounting bracket for fastening to the driver-pump head. The dispensing platform contains a flow channel and a self-sealing spout to prevent drying of the dentifrice material at the spout. The self-sealing spout opens and closes automatically during a pumping action. The brush element with a spout opening is detachably mounted over the spout fixed on the dispensing platform to allow for brush oscillation around the spout and receive the dentifrice material dispensed from the flow channel. Different drive mechanisms are used to impart rotary, lateral or longitudinal oscillation on a brush element in a brush unit.